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Plantronics H81N-CD TriStar Headset (Over the Ear, Noise Canceling) (40203-14 aka 8K781AA) - VDO Communications
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Plantronics 29960-01 Clear Voice Tube for Tristar (h81/h81n) & Encore (h91/h91/h101) - clear/white : Amazon.co.uk: Electronics & Photo
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Poly TriStar On-the-Ear Noise Cancelling Controller & Dispatch Headset - Build to Order - Business Telecom Products
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